[08/14] vcompound: Fallback for zone wait table

[Christoph Lameter <clameter@sgi.com>]

[-- Attachment #1: 0010-vcompound-Fallback-for-wait-table.patch --]
[-- Type: text/plain, Size: 1021 bytes --]

Currently vmalloc may be used for allocating zone wait table.
Use virtual compound page in order to be able to use a physically contiguous
page that can then use the large kernel TLBs.

Drawback: The zone wait table is rounded up to the next power of two which
may cost some memory.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
---
 mm/page_alloc.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux-2.6.25-rc5-mm1/mm/page_alloc.c
===================================================================
--- linux-2.6.25-rc5-mm1.orig/mm/page_alloc.c	2008-03-20 20:03:50.885900600 -0700
+++ linux-2.6.25-rc5-mm1/mm/page_alloc.c	2008-03-20 20:04:43.282104684 -0700
@@ -2866,7 +2866,8 @@ int zone_wait_table_init(struct zone *zo
 		 * To use this new node's memory, further consideration will be
 		 * necessary.
 		 */
-		zone->wait_table = vmalloc(alloc_size);
+		zone->wait_table = __alloc_vcompound(GFP_KERNEL,
+						get_order(alloc_size));
 	}
 	if (!zone->wait_table)
 		return -ENOMEM;

--